US20130142159A1 - Method for transmitting and receiving channel information, and ue and base station using the same - Google Patents

Method for transmitting and receiving channel information, and ue and base station using the same Download PDF

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Publication number
US20130142159A1
US20130142159A1 US13/816,456 US201113816456A US2013142159A1 US 20130142159 A1 US20130142159 A1 US 20130142159A1 US 201113816456 A US201113816456 A US 201113816456A US 2013142159 A1 US2013142159 A1 US 2013142159A1
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Prior art keywords
carrier
channel information
component carriers
downlink component
information
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English (en)
Inventor
Sungkwon Hong
Kibum KWON
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Pantech Co Ltd
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Pantech Co Ltd
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    • H04W72/042—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/231—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the layers above the physical layer, e.g. RRC or MAC-CE signalling

Definitions

  • the present invention relates to a wireless communication system transmitting and receiving channel information through a carrier aggregation.
  • an amount of channel information, which should notified to the based station by the user equipment through an UpLink (UL), has been increasing in order to enable the base station to recognize a DownLink (DL) channel state.
  • UL UpLink
  • a method of receiving channel information by a base station in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: transmitting control information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting the channel information to a user equipment through one of downlink component carriers; and receiving channel information for a downlink component carrier that is linked to the uplink component carrier designated by the carrier identification information from the user equipment through the designated uplink component carrier.
  • a method of receiving channel information by a base station in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: transmitting information for a downlink component carrier to a user equipment through a Radio Resource Control (RRC) signaling, wherein channel information for the downlink component carrier is transmitted through an uplink component carrier; transmitting control information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting the channel information to a user equipment through one of downlink component carriers; and receiving channel information for a downlink component carrier configured through the RRC signaling from the user equipment through the uplink component carrier.
  • RRC Radio Resource Control
  • a method of receiving channel information by a base station in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: transmitting control information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting the channel information to a user equipment through one of downlink component carriers; and receiving channel information for a plurality of downlink component carriers transmitted in series from the user equipment through the uplink component carrier.
  • a base station in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: a control information transmitter for transmitting control information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting the channel information to a user equipment through one of downlink component carriers; and a channel information receiver for receiving channel information for a downlink component carrier that is linked to the uplink component carrier designated by the carrier identification information from the user equipment through the designated uplink component carrier.
  • a base station in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: a control information transmitter for transmitting control information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting the channel information to a user equipment through one of downlink component carriers; and a channel information receiver for receiving channel information for a downlink component carriers configured through an RRC signaling transmitted to the user equipment from the user equipment through the uplink component carrier.
  • a base station in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: a control information transmitter for transmitting control information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting the channel information to a user equipment through one of downlink component carriers; and a channel information receiver for receiving channel information for multiple downlink component carriers transmitted in series from the user equipment through the uplink component carrier.
  • a method of transmitting channel information by a user equipment in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: receiving control information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting the channel information from a base station through one of downlink component carriers; and transmitting channel information for a downlink component carrier that is linked to the uplink component carrier designated by the carrier identification information to the base station through the designated uplink component carrier.
  • a method of transmitting channel information by a user equipment in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: receiving information for a downlink component carrier to a base station through a Radio Resource Control (RRC) signaling, wherein channel information for the downlink component carrier is transmitted through an uplink component carrier; receiving control information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting the channel information from a base station through one of downlink component carriers; and transmitting channel information for a downlink component carrier configured through the RRC signaling to the base station through the uplink component carrier.
  • RRC Radio Resource Control
  • a method of transmitting channel information by a user equipment in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: receiving control information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting the channel information from a base station through one of downlink component carriers; and transmitting channel information for a plurality of downlink component carriers in series to the base station through the uplink component carrier.
  • a user equipment in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: a control information receiver for receiving control information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting the channel information from a base station through one of downlink component carriers; and a channel information transmitter for transmitting channel information for a downlink component carrier that is linked to the uplink component carrier designated by the carrier identification information to the base station through the designated uplink component carrier.
  • a user equipment in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: a control information receiver for receiving control information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting the channel information from a base station through one of downlink component carriers; and a channel information transmitter for transmitting channel information for a downlink component carriers configured through an RRC signaling transmitted from the base station to the base station through the uplink component carrier.
  • a user equipment in a carrier aggregation wireless communication system using one or more downlink component carriers and one or more uplink component carriers including: a control information receiver for receiving information including an aperiodic channel information request and carrier identification information designating an uplink component carrier reporting channel information from a base station through one of downlink component carriers; a channel information transmitter for transmitting channel information for multiple downlink component carriers in series to the base station through the uplink component carrier.
  • FIG. 1 illustrates a wireless communication system for transmitting channel information according to an embodiment of the present invention
  • FIG. 2 illustrates a concept of a scheduling between a carrier aggregation and a carrier in the wireless communication system according to an embodiment of the present invention
  • FIG. 3 is a diagram of a base station and a user equipment in the wireless communication system according to an embodiment of the present invention
  • FIG. 4 is a diagram of PDCCH transmitting control information of FIG. 3 ;
  • FIG. 5 illustrates a concept of the scheduling between a carrier aggregation and a carrier in the wireless communication system according to another embodiment of the present invention
  • FIG. 6 and FIG. 7 illustrate concepts of a channel information transmission method for transmitting channel information for one configured downlink component carrier through a PUSCH of one uplink component carrier according to another embodiment of the present invention
  • FIG. 8 illustrates a concept of a channel information transmission method for transmitting channel information for all of two or more configured downlink component carriers through a PUSCH of one uplink component carrier according to another embodiment of the present invention.
  • FIG. 9 illustrates a concept of a channel information transmission method for transmitting channel information for some of two or more configured downlink component carriers through a PUSCH of one uplink component carrier according to another embodiment of the present invention.
  • the present invention has been made in an effort to simplify a control channel and reduce channel information to be transmitted in transmitting the channel information through a carrier aggregation. Further, the present invention has been made in an effort to enable an efficient operation of the control channel in transmitting the channel information for a plurality of carriers.
  • the present invention has an effect of simplifying the control channel and efficiently transmitting the channel information to be transmitted, in transmitting the channel information through the carrier aggregation.
  • FIG. 1 illustrates a wireless communication system 100 for transmitting channel information according to an embodiment of the present invention.
  • FIG. 1 is a block diagram schematically illustrating the wireless communication system to which the present invention is applied.
  • the wireless communication system refers to a system for providing various communication services such as voice, packet data, etc.
  • the wireless communication system 100 includes a Base Station (BS) 110 and a User Equipment (UE) 120 .
  • BS Base Station
  • UE User Equipment
  • the user equipment 120 has an inclusive meaning referring to a user terminal in a wireless communication, and should be construed as a concept including not only a User Equipment (UE) in WCDMA, LTE, High Speed Packet Access (HSPA), etc. but also Mobile Station (MS), User Terminal (UT), Subscriber Station (SS), and wireless device and an Mobile Station (MS) in Global System for Mobile Communication (GSM).
  • UE User Equipment
  • HSPA High Speed Packet Access
  • MS Mobile Station
  • UT User Terminal
  • SS Subscriber Station
  • GSM Global System for Mobile Communication
  • the base station 110 or a cell refers to a station with which the user equipment 120 communicates, and may be referred to by other terms such as a node-B, an evolved Node-B (eNB), a Base Transceiver System (BTS), an access point, and etc.
  • a node-B an evolved Node-B (eNB)
  • eNB evolved Node-B
  • BTS Base Transceiver System
  • access point an access point, and etc.
  • the user equipment 120 and the base station 110 are used to include comprehensive meanings such as transmission and reception subjects for two links (uplink and downlink) used to implement a technology or a technological idea described in the present invention, and not limited to a specifically designated term or word.
  • Embodiments of the present invention can be applied to resource allocation in asynchronous wireless communication, which is evolving to the Long Term Evolution (LTE) and the LTE-advanced (LTE-A) through the GSM, the WCDMA, and the HSPA, and resource allocation in synchronous wireless communication, which is evolving to the CDMA, the CDMA-2000, and the UMB.
  • LTE Long Term Evolution
  • LTE-A LTE-advanced
  • the present invention shall not be restrictively construed based on a particular wireless communication field and shall be construed to include all technical fields to which the concept of the present invention can be applied.
  • the base station 110 transmits control information 130 to the user equipment 120 through a control channel and the user equipment 120 can receive the control information through the control channel.
  • the control information 130 may include information related to the channel information.
  • the control channel may be, for example, a Physical Downlink Control Channel (PDCCH) in the Long Term Evolution/Long Term Evolution-Advanced (LTE/LTE-A).
  • PDCCH Physical Downlink Control Channel
  • LTE/LTE-A Long Term Evolution/Long Term Evolution-Advanced
  • the user equipment 120 can transmit one or more channel information 140 of one or more component carriers in a carrier aggregation, which will be described later in detail, based on channel information measured for each subband.
  • the base station 110 receives the channel information 140 , and can perform a scheduling function selecting the component carriers or allocating the subband of each component carrier.
  • the aforementioned channel information 140 measured for each subband may, for example, include at least one of a Channel Quality Indicator (hereinafter, referred to as a “CQI”), a Precoding Matrix Indicator (hereinafter, referred to as a “PMI”), a Rank Indicator (hereinafter, referred to as a “RI”), a Signal to Noise Ratio (hereinafter, referred to as an “SNR”), and a Frame Error Rate (FER).
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • RI Rank Indicator
  • SNR Signal to Noise Ratio
  • FER Frame Error Rate
  • the aforementioned wireless communication system 100 including the base station 110 and the user equipment 120 according to an embodiment of the present invention may be applied to the LTE-A defining a technology for the aggregation of multiple carriers.
  • FIG. 2 illustrates a concept of the scheduling between the carrier aggregation and the carrier in the wireless communication system according to an embodiment of the present invention.
  • the wireless communication system 200 may use the carrier aggregation having M downlink component carriers for the downlink (M is a natural number selected from 1 to 5), and N uplink component carriers for the uplink (N is a natural number selected from 1 to 5), as shown in FIG. 2 .
  • the component carrier refers to a component carrier included in a plurality of component carriers used in the wireless communication system 200 .
  • the carrier aggregation does not allocate and construct one band or one carrier for the downlink and the uplink. Instead, the carrier aggregation combines and constructs a plurality of bands, so it is possible to improve the communication quality and the capacity. Meanwhile, for a Time Division Duplex (TDD), the carrier aggregation follows a method extending the conventional single band or carrier allocated to all uplinks.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • maximally available component carriers for a specific user equipment vary according to each user equipment, and the aggregation of the maximally available component carriers may be differently defined according to each user equipment.
  • the aggregation of the maximally available component carriers may be defined as a configuration component carrier set.
  • each of downlink component carriers 210 , 220 , and 230 include a data channel. Meanwhile, each of the downlink component carriers 210 , 220 , and 230 may or may not include the control channel. That is, all of the downlink component carriers may include the control channel, or only some of the downlink component carriers may include the control channel.
  • Each of uplink component carriers 240 and 250 include the data channel. Meanwhile, each of the uplink component carriers 240 and 250 may or may not include the control channel. That is, all of the uplink component carriers 240 and 250 may include the control channel, or only some of the uplink component carriers may include the control channel.
  • a Primary Component Carrier (PCC) and a Secondary Component Carrier (SCC) may exist for the uplink and the downlink.
  • the primary component carrier includes the control channel such as a Physical Uplink Control Channel (PUCCH), to function as a component carrier having a main role in transmitting control information and data in the communication between the base station and the user equipment, and may be configured such that it is specific to the user equipment.
  • PUCCH Physical Uplink Control Channel
  • Other component carriers except the PCC are defined as the SCC.
  • the downlink component carrier 210 among the downlink component carriers 210 , 220 , and 230 corresponds to the downlink PCC, and other downlink component carriers 220 and 230 correspond to the downlink SCC.
  • the uplink component carrier 240 among the uplink component carriers 240 and 250 corresponds to the uplink PCC and another uplink component carrier 250 corresponds to the uplink SCC.
  • the downlink PCC 210 is a single component carrier, but can allocate both of DownLink (DL) grants and UpLink (UL) grants for not only the uplink PCC 240 but also other SCCs 220 , 230 , and 250 by the scheduling between carriers.
  • the uplink PCC 240 is a single component carrier, but all of Physical Uplink Control Channels (PUCCHs) for the uplink may be (explicitly or implicitly) allocated to the uplink PCC through the proper resource allocation.
  • PUCCHs Physical Uplink Control Channels
  • the term ‘explicitly’ means a case of exactly informing the resource allocation through a higher layer signaling
  • the term ‘implicitly’ means a case of informing the resource allocation through a proper rule including a location in a control region of a Physical Downlink Control Channel (PDCCH).
  • PDCH Physical Downlink Control Channel
  • the control channel for transmitting dynamic resource allocation information for an allocated shared channel and control information required for the transmission is required.
  • the control channel corresponds to the PDCCH.
  • the downlink control channel, through which the control information is transmitted, includes a Physical Control Format Indicator Channel (PDFICH) and a Physical Hybrid ARQ Indicator Channel (PHICH) as well as the Physical Downlink Control Channel (PDCCH).
  • PDFICH Physical Control Format Indicator Channel
  • PHICH Physical Hybrid ARQ Indicator Channel
  • PDCCH Physical Downlink Control Channel
  • the PDCCH is positioned at a certain part (search space) in a control region in a subframe, and the PDCCH is decoded through a blind decoding from a point of view of the user equipment.
  • the PDCCH is divided into various DCI formats and provides common control information or control information specific to the user equipment.
  • control information specific to the user equipment is transmitted, information for decoding the PDSCH or the PUSCH in a point of view of the user equipment and control information required for the communication are provided to the user equipment at the same time.
  • All DCI formats of the PDCCH for the downlink data transmission are defined as the DownLink grant (DL grant), and all DCI formats of the PDCCH for the uplink data transmission are defined as the UpLink grant (UL grant).
  • DL grant DownLink grant
  • UL grant UpLink grant
  • the control information transmission method in the carrier aggregation is extended to multiple component carriers, and a cross-carrier scheduling, which performs a scheduling from one component carrier to another component carrier, is possible in the method.
  • the cross-carrier scheduling can be performed by adding a Carrier Indicator Field (CIF), which is carrier identification information which will be described later in detail, to a payload of the PDCCH. It is possible to allocate a 3-bit field to the CIF and the CIF can indicate a maximum of 5 component carriers. In the CIF, which is the carrier identification information, only 5 values among available values of 0 to 7 may be practically allocated to the component carriers.
  • the carrier identification information is referred to as the CIF, but the carrier identification information of the present invention is not limited thereto.
  • the downlink PCC 210 may include first to third PDCCHs 211 , 212 , and 213 including the CIF indicating each of the downlink PCC 210 and the downlink SCCs 220 and 230 , and fourth and fifth PDCCHs 214 and 215 including the CIF indicating the uplink PCC 240 and the uplink SCC 250 .
  • Each of the PDCCHs 211 to 215 provides the user equipment with information for decoding a shared channel included in the component carrier indicated by the CIF, for example, first to third PDSCHs 216 , 217 , and 218 , and first and second PUSCHs 219 a and 219 b , and the control information required for the communication.
  • an aperiodic CQI reporting handles only CQI/PMI reporting for the single carrier.
  • an extended design is required.
  • a most simple extension method is encoding and reporting the CQI according to an independent mode after a CQI reporting type is determined for each component carrier.
  • Uplink Control Information including channel information of a PUSCH type can be transmitted on the PUSCH of one component carrier.
  • the UCI and the channel information are understood to have the same meaning, but they may have different meanings according to purposes.
  • the channel information such as the CQI/PMI may be transmitted on one PUSCH, wherein the channel information may be sequentially transmitted with a discrimination between the CQI/PMI according to time (for each subframe).
  • a sequential transmission of the channel information may generate a time delay in the channel information transmission, which may cause a difference between a measured and reported value of the CQI/PMI/RI and a value of the CQI/PMI/RI applied to the real scheduling in the channel information.
  • the base station informs the user equipment of the channel information of the downlink component carrier, which will be transmitted, and the uplink component carriers, through which the channel information will be transmitted.
  • the user equipment should transmit the channel information of the downlink component carrier designated from the channel information through the designated uplink component carrier.
  • FIG. 3 is a diagram of the base station and the user equipment in the wireless communication system according to an embodiment of the present invention.
  • the wireless communication system 300 includes the base station 310 and the user equipment 320 .
  • the base station 310 includes a control information transmitter 312 and a channel information receiver 314 .
  • the user equipment 320 includes a control information receiver 322 and a channel information transmitter 324 corresponding to a construction of the base station 310 .
  • the control information transmitter 312 transmits resource allocation information and control information 330 required for the transmission to the user equipment through a control channel.
  • the control information receiver 322 receives the control information 330 from the base station 310 through the control channel. Particularly, the control information transmitter 312 transmits the control information 330 , which will be described later, related to the channel information to the user equipment 320 through the control channel.
  • the channel information transmitter 324 transmits channel information 340 , which is measured for each subband, to the base station 310 , and the channel information receiver 314 receives the channel information 340 . Particularly, the channel information transmitter 324 transmits the channel information 340 to the base station 310 according to the control information received by the control information receiver 322 , and the channel information receiver 314 receives the channel information 340 .
  • the control information 330 includes both the control information described above with reference to FIG. 2 and the control information, which will be described later.
  • the control information 330 includes information related to the channel information, which has been described before or will be described later.
  • the downlink control channel, through which the control information 330 is transmitted includes a Physical Control Format Indicator Channel (PCFICH) and a Physical Hybrid ARQ Indicator Channel (PHICH) other than the Physical Downlink Control Channel (PDCCH).
  • PCFICH Physical Control Format Indicator Channel
  • PHICH Physical Hybrid ARQ Indicator Channel
  • the control information transmitter 312 is configured to transmit the control information 330 to the user equipment 320 through the PDCCH, but the control information transmitter 312 of the present invention is not limited thereto.
  • FIG. 4 is a diagram of the PDCCH transmitting the control information of FIG. 3 .
  • the PDCCH 400 which is one of the control channels transmitting the control information 330 , is divided into various DCI formats, and provides the control information specific to the user equipment.
  • the control information specific to user equipment is transmitted, information for decoding the PDSCH or the PUSCH from a point of view of the user equipment and control information required for the communication are provided to the user equipment at the same time.
  • the PDCCH 400 may include the CIF 410 , which is the carrier identification information, a CQI triggering or a CQI request bit 420 , and another PDCCH payload 430 .
  • another PDCCH payload 430 refers to control information included in the uplink grant other than the CIF 410 and the CQI triggering bit 420 .
  • An order of fields of the CIF 410 , the CQI triggering bit 420 , and another PDCCH payload 430 is not limited to FIG. 4 , and various orders may be applied.
  • the CIF 410 may be positioned at the foremost portion or the backmost portion of the PDCCH.
  • the scheduling between the carriers can be performed by adding 3-bit CIF 410 indicating a maximum of 5 component carriers to the payload of the PDCCH 400 .
  • 3-bit CIF 410 indicating a maximum of 5 component carriers to the payload of the PDCCH 400 .
  • 5 values among available values of 0 to 7 included in the 3-bit CIF 410 may be allocated to the component carrier.
  • the control information 330 is the downlink grant
  • the CIF 410 added to the control information 330 indicates the downlink component carriers.
  • the control information 330 is the uplink grant
  • the CIF 410 added to the control information 330 may indicate the uplink component carriers.
  • a DCI format 0 or another format which is one of the DCI formats of the PDCCH 400 , includes the CQI triggering or the CQI request bit 420 aperiodically requesting the Uplink Control Information (UCI) such as the CQI/PMI/RI information for the downlink component carrier and the DCI format 0 or another format is set to “1”, the user equipment transmits the channel information 330 based on the setting.
  • the CQI triggering or the CQI request means a message including a request for the CQI, which is one of the channel information, to the user equipment by the base station.
  • Various channel information 340 transmitted to the uplink may include at least one of the Channel Quality Indicator (CQI), the Precoding Matrix Indicator (PMI), the Rank Indicator (RI), the Signal to Noise Ratio (SNR), and the Frame Error Rate (FER) as described above.
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • RI Rank Indicator
  • SNR Signal to Noise Ratio
  • FER Frame Error Rate
  • the CQI is described as an example of the channel information 340 , but the CQI of the present invention is not limited thereto.
  • the CQI of the present invention is not limited thereto and may refer to certain control information indicating the channel information.
  • CQI information is divided into a periodic CQI reporting and an aperiodic CQI reporting.
  • the periodic CQI reporting is used to transmit 4 to 13-bit information with 2/2a/2b format, and the CQI is reported by a proper format according to a type of a band to be reported, a fact whether a MIMO method is used, a degree of the rank, and a CP length of the system.
  • the aperiodic CQI/PMI reporting is scheduled on the PUSCH by setting the bit of the aperiodic CQI triggering (or request) to 1 in the uplink grant by the base station.
  • a type of the CQI/PMI/RI reporting (reporting has the same meaning as transmission) is configured by the RRC signaling and constructed in a relation between a downlink transmission mode and an available CQI reporting type.
  • the aperiodic CQI reporting is transmitted by the PUSCH, to which the uplink resource is allocated by the base station 310 , and the CQI information is reported with a discrimination of feedbacks such as a feedback (wideband feedback) for all bands, a feedback (base station construction subband feedback) for a subband constructed by the base station 310 , and a subband feedback (user equipment selection subband feedback) set by the user equipment 320 .
  • a size of the subband is determined depending on a size of a system band in which the wireless communication system is configured.
  • the feedback for all bands means that the user equipment 320 reports one wideband CQI value for all system bands.
  • the wideband feedback is an average value of CQI values of the subbands for all the system bands.
  • the feedback (base station construction subband feedback) for the subband constructed by the base station 310 means that the user equipment reports the difference between one wideband CQI value for all the system bands and the CQI value for each subband. The difference is reported in a 2-bit differential form of the wideband CQI value.
  • Subband differential CQI offset subband CQI index wideband CQI index (1)
  • a size k of the subband for each band is defined in Table 2.
  • the feedback (user equipment selection subband feedback) set by the user equipment 320 reports CQI values for M selection subbands having a size of k, in a differential form.
  • Subband differential CQI (an average index of M selection subbands wideband CQI index) (2)
  • ⁇ x y ⁇ ⁇ ( x y ) x ⁇ y 0 x ⁇ y , ⁇ ⁇ ( x y )
  • N refers to the total number of subbands.
  • the number M of selection subbands and the size k of the subbands are selected in the manner as defined in Table 3.
  • a CQI/PMI combination mode available for each transmission mode is defined in Table 5.
  • the user equipment 310 transmits information related to the channel information in the control information 330 to the base station 320 in a form of the remaining code point of the CIF 410 included in the uplink grant and the combination of the remaining code point of the CIF 410 and the aperiodic CQI triggering bit 420 in the carrier aggregation shown in FIG. 2
  • values of 0 to 4 indicate the component carriers, and values of 5 to 7 may indicate the remaining reserved code points.
  • the code point indicating a bit length of the CIF 410 or the component carrier, the remaining code point, or the reserved code point may be changed.
  • the code point indicating the component carrier represents the number of component carriers, and the number of counted component carriers may have various definitions such as the number of component carriers configured to physically communicate by the user equipment, the number of component carriers configured by the higher layer signaling, and the number of activated component carriers determined by an MAC signaling.
  • the number of reserved code points is changed depending on the definitions.
  • the number of counted component carriers when the number of counted component carriers is defined as the number of component carriers configured to communicate by the user equipment, the number of component carriers configured to communicate by the user equipment may be 1 to 5, and for example, may be 3. In a case where the number of component carriers is 3, the code points indicating the component carriers are 0 to 2 and the reserved code points may be 3 to 7.
  • the higher layer signaling may refer to the RRC signaling, which means that information required for the aperiodic CQI/PMI/RI reporting is exchanged suitably for the RRC configuration.
  • the higher layer signaling is not limited thereto.
  • FIG. 5 illustrates a concept of the scheduling between the carrier aggregation and the carrier in the wireless communication system according to another embodiment of the present invention.
  • the wireless communication system 500 uses the carrier aggregation including three downlink component carriers 510 , 520 , and 530 , and two uplink component carriers 540 and 550 .
  • the downlink PCC 510 may include first to third PDCCHs (not shown) including the CIF indicating each of the downlink PCC 510 and the downlink SCCs 520 and 530 , and fourth and fifth PDCCHs 514 and 515 including the CIF indicating the uplink PCC 540 and the uplink SCC 550 , in the control region of the downlink PCC 510 , which is identically illustrated in FIG. 2 .
  • the fourth and fifth PDCCHs 514 and 515 including the CIF indicating the uplink PCC 540 and the uplink SCC 550 provide the user equipment with information for decoding first and second PUSCHs 519 a and 519 b included in the uplink component carrier indicated by the CIF and control information required for the communication at the same time.
  • the fourth and fifth PDCCHs 514 and 515 may be the same as the PDCCH 400 described with reference to FIG. 4 , or may not be the same.
  • the PDCCH including the fourth and fifth PDCCHs 514 and 515 will be considered the same as the PDCCH 400 shown in FIG. 400 , but the PDCCH of the present invention is not limited thereto.
  • the linkage relation may be formed by an RRC signaling.
  • the linkage relation may be notified to the user equipment by a predetermined rule or by implicitly using separate control information.
  • the downlink PCC 510 and the uplink PCC 540 have the linkage relation therebetween, and the first downlink SCC 520 and the uplink SCC 550 have the linkage relation therebetween. It is possible to designate the component carrier, to which channel information should be reported, by using the linkage relation.
  • FIG. 6 and FIG. 7 illustrate concepts of the channel information transmission method for transmitting channel information for one constructed downlink component carrier through the PUSCH of one uplink component carrier according to another embodiment of the present invention.
  • the downlink component carrier which should be reported, may be configured by the downlink component carrier linked with the uplink grant.
  • the uplink grant indicates the uplink PCC as shown in FIG. 6 .
  • the downlink component carrier linked with the uplink PCC 620 indicated by the CIF value “0” is the downlink PCC 610 so that channel information of the downlink PCC 610 may be reported to the PUSCH of the uplink PCC 620 .
  • the uplink component carrier in which the PUSCH is included, reported by the uplink grant including the CQI triggering bit 420 is determined, and channel information such as the CQI/PMI/RI of the downlink component carrier linked with the uplink component carrier may be reported through the PUSCH of the uplink component carrier.
  • the CQI/PMI/RI for the downlink component carrier which does not have the linkage relation may be reported by using the control information of the downlink component carrier, such as the control information of the downlink PCC 610 , with the remaining code point of the CIF 410 or the combination of the remaining code point and the CQI triggering bit
  • the downlink component carriers which are not linked with the uplinks, are indicated as described above, and the uplink component carrier, to which the PUSCH for the reporting is transmitted, is determined by the higher layer signaling or a determined rule (for example, uplink PCC 650 ) and then transmitted.
  • the reserved code point and the used code point may be discriminated from each other based on the maximum number of carriers. Further, as described below, the reserved code point and the used code point may be semi-statically determined by an RRC configuration or the maximum number of carriers available for a specific user equipment, or may be determined by activation/deactivation through an MAC signaling.
  • the linkage relation may be established by the RRC signaling.
  • the linkage relation may be notified to the user equipment through a predetermined rule or may be implicitly notified by using separate control information.
  • the downlink component carriers 612 to 614 which are not linked with the uplink grant, are indicated by using the remaining code points of the CIF 410 on an assumption that there are 5 downlink component carriers 610 to 614 and two uplink component carriers 620 and 621 .
  • values 0 to 1 indicate the uplink component carriers 620 and 621 and values 2 to 7 may be the reserved code points in the 3-bit CIF 410 .
  • the uplink component carriers 620 and 621 of the CIF having values 0 to 1 have the linkage relation with the downlink component carriers 610 and 611 of the CIF having values 0 to 1, there is no uplink component carriers linked with the downlink component carriers 612 to 614 of the CIF having values 2 to 7.
  • values 2 to 7 are allocated to the CIF in the uplink grant and the CQI triggering bit 420 is set, it means that the channel information reporting such as the CQI/PMI/RI reporting for the downlink component carriers 612 to 614 having no linkage relation with the uplink grant is requested.
  • the downlink component carriers having values 2 to 7, which have no linkage relation may be indicated by the downlink component carriers to which the channel information such as the CQI/PMI/RI should be reported.
  • the CIF values in the uplink grant and the CIF values identifying the downlink component carrier are the same is discussed, but another example where the CIF values in the uplink grant and the CIF values identifying the downlink component carrier are not the same is possible.
  • the base station can inform the user equipment of the downlink component carrier, which has no linkage relation, indicated by the CIF values in the uplink grant through the downlink component carrier, to which the channel information such as the CQI/PMI/RI should be reported, through a higher layer signaling, a predetermined rule, or separate control information.
  • code points 0 to 4 of the CIF are used to indicate the uplink component carriers 720 to 724 .
  • the reserved code points have values of 5 to 7
  • the reserved code points cannot indicate all the downlink component carriers 711 to 714 , since the maximum number of downlink component carriers 711 to 714 , which are not linked with the uplink grant, is four.
  • the downlink component carriers 711 to 714 which are not linked with the uplink grant, can be indicated by using the reserved code points of the CIF 410 and the combinations. That is, when the CQI triggering bit 420 is “0” and the reserved code point has a specific value, it is considered as a triggering case and it may be used to indicate the downlink component carriers having no linkage relation as shown in Table 6.
  • the channel information reporting such as the CQI/PMI/RI reporting can be performed through a specific uplink component carrier by the higher layer signaling, for example, the PUSCH of the uplink component carrier corresponding to the CIF 1, or through the PUSCH of the uplink component carrier corresponding to a predetermined rule (for example, PCC, CIF 0).
  • a predetermined rule for example, PCC, CIF 0
  • the channel information transmission method for transmitting the channel information for configured one downlink component carrier through the PUSCH of one uplink component carrier according to another embodiment of the present invention has been described.
  • a channel information transmission method for transmitting the channel information for configured two or more downlink component carriers through the PUSCH of one uplink component carrier according to another embodiment of the present invention will be described.
  • FIG. 8 illustrates a concept of the channel information transmission method for transmitting the channel information for all of configured two or more downlink component carriers through the PUSCH of one uplink component carrier according to another embodiment of the present invention.
  • the channel information reporting such as the CQI/PMI reporting for a plurality of component carriers instead of each component carrier, may be transmitted through one PUSCH 822 of one uplink component carrier 820 .
  • the aperiodic channel information 831 to 835 is constructed for each of the configured downlink component carriers 810 to 814 , and all the channel information 831 to 835 may be transmitted on one PUSCH 822 in one subframe 824 in series.
  • a transmission mode of the channel information reporting such as the CQI/PMI/RI of each component carrier may be determined by the higher layer signaling. That is, the one PUSCH 822 in one subframe 824 is punctured for an Uplink Shared Channel (UL-SCH) and the aperiodic channel information may be reported through the remaining regions or portions.
  • UL-SCH Uplink Shared Channel
  • FIG. 9 illustrates a concept of the channel information transmission method for transmitting the channel information for a part of two or more constructed downlink component carriers through the PUSCH of one uplink component carrier according to another embodiment of the present invention.
  • channel information for a part of the two or more component carriers may be transmitted through the PUSCH of multiple subframes of one uplink component carrier.
  • channel information 931 for the DL PCC 910 may be transmitted through the PUSCH of a first subframe 924 of the UL PCC 920 in a first aperiodic reporting and channel information 932 and 933 for the SCC# 1 911 and the SCC# 2 912 may be transmitted through the PUSCH of a second subframe 925 of the UL PCC 920 in a second aperiodic reporting.
  • unspecific subframes may be included among the first subframe 924 , the second subframe 925 , and a third subframe 926 .
  • the period indicating the number of subframes of the uplink component carrier, on which the channel information is divided for transmission, the number of channel information elements of the downlink component carrier transmitted in each subframe, and the channel information reporting transmission mode may change.
  • they are notified to the user equipment 320 by the higher layer signaling or by using the reserved code points of the CIF 410 included in the control information (uplink grant) or the combinations of the reserved code points of the CIF 410 and the CQI triggering bit 420 .
  • one of the reserved code points may be used as the triggering for the channel information reporting of multiple downlink component carriers.
  • the component carrier including the PUSCH through which the channel information is transmitted is assumed by a regular rule or predetermined by the higher layer signaling.
  • the component carrier assumed by the regular rule may be the PCC.
  • the component carrier of the present invention is not limited thereto and may be a specific SCC.
  • the used reserved code points of the CIF 410 and the reporting mode of the component carrier are determined by the higher layer signaling.
  • the downlink component carriers which will be reported to each of the reserved code points of the CIF 410 together with the channel information reporting triggering, may be indicated as shown in Table 7 by using a plurality of reserved code points of the CIF 410 .
  • the component carrier including the PUSCH through which the channel information is transmitted is assumed by the regular rule or predetermined by the higher layer signaling as well.
  • the component carriers corresponding to the reserved code points and the combinations may be determined by the higher layer signaling.
  • a reporting mode of each component carrier may be determined by the higher layer signaling.
  • aperiodic CQI triggering bit 420 When the aperiodic CQI triggering bit 420 is “0”, more component carriers to be reported may be indicated by using the code points of the CIF 410 as defined in Table 8.
  • the control information transmitter 312 of the base station 310 transmits the control information 330 including a channel information request such as the aperiodic CQI trigger bit 420 and carrier identification information designating the downlink component carrier, which will report the channel information such as the CIF 410 , to the user equipment 320 through one of the downlink component carriers as shown in the first and second examples.
  • the channel information receiver 314 receives the channel information 330 for the downlink component carrier designated by the carrier identification information such as the CIF 410 from the user equipment through one of the aperiodic uplink component carriers.
  • the control information receiver 322 of the user equipment 320 receives the control information 330 including the channel information request such as the aperiodic CQI triggering bit 420 and the carrier identification information designating the downlink component carrier, which will report the channel information such as the CIF 410 , from the base station 310 through one of the downlink component carriers.
  • the channel information transmitter 324 transmits the channel information for the downlink component carrier designated by the carrier identification information such as the CIF 410 to the base station 310 through one of the uplink component carriers.
  • the designated downlink component carrier may be different although the carrier identification information such as the CIF 410 is the same code point.
  • the downlink component carrier which will report the channel information, may be designated through the combinations of the aperiodic CQI triggering bit and the reserved code point.
  • the uplink component carrier in which the channel information is carried on each of the reserved code points together with the triggering of the channel information reporting, may be indicated as shown in Table 9 by using a plurality of reserved code points, but it is not limited thereto.
  • a period of the downlink component carrier, to which the channel information is reported, and the component carriers, which will be transmitted in each channel information reporting section, may be determined by the higher layer signaling.
  • the channel information is transmitted through the PUSCH included in the PCC 6
  • the channel information is transmitted through the first SCC designated by the base station (higher layer signaling) 7
  • the channel information is transmitted through the second SCC designated by the base station (higher layer signaling)
  • the uplink component carrier in which the channel information is carried on each of the reserved code points together with the triggering of the channel information reporting, may be indicated as shown in Table 10 by using a plurality of reserved code points, but it is not limited thereto.
  • CQI request CIF Information 1 5 The channel information is transmitted through the PUSCH included in the uplink PCC 1 6 The channel information is transmitted through the PUSCH included in the first SCC designated by the base station (higher layer signaling) 1 7 The channel information is transmitted through the PUSCH included in the second SCC designated by the base station (higher layer signaling) 0 5 The channel information is transmitted through the PUSCH included in the third SCC designated by the base station (higher layer signaling) 0 6 The channel information is transmitted through the PUSCH included in the fourth SCC designated by the base station (higher layer signaling)
  • the combinations of the aperiodic CQI triggering bit 420 and the reserved code point of the CIF 410 may be changed.
  • the control information transmitter 312 of the base station 310 transmits the control information 330 including a channel information request such as the aperiodic CQI trigger bit 420 and carrier identification information designating the uplink component carrier, which reports the channel information for one of the downlink component carriers such as the CIF 410 , to the user equipment 320 through one of the downlink component carriers as shown in the third and fourth examples.
  • the channel information receiver 314 receives the channel information 330 for one of the downlink component carriers from the user equipment 320 through the aperiodic uplink component carrier designated by the carrier identification information.
  • the control information receiver 322 of the user equipment 320 receives the control information 330 including the channel information request such as the aperiodic CQI triggering bit 420 and the carrier identification information designating the downlink component carrier, which reports the channel information for one of the downlink component carriers such as the CIF 410 , from the base station 310 through one of the downlink component carriers.
  • the channel information transmitter 324 transmits the channel information 340 for one of the downlink component carriers to the base station 310 through the uplink component carriers designated by the carrier identification information.
  • the combinations of the reserved code point of the CIF 410 and the aperiodic CQI triggering bit 420 may be used to select a mode for the channel information reporting of multiple downlink component carriers.
  • a UCI reporting mode of multiple downlink component carriers or a channel information reporting mode for a Multiple Input Multiple Output (MIMO) other than the currently existing reporting mode (single component carrier reporting mode) may be newly defined.
  • MIMO Multiple Input Multiple Output
  • the various reporting modes exist and the modes are configured to be dynamically converted only the reserved code points of the CIF 410 are used as shown in Table 11 or the combinations of the reserved code points and the aperiodic CQI triggering bit 420 are used as shown in Table 12, to transmit the channel information mode.
  • the base station 310 includes the control information transmitter 312 transmitting the control information 330 including the channel information request and the carrier identification information designating the channel information transmission mode of the downlink component carrier to the user equipment 320 through one of the downlink component carriers, and the channel information receiver 314 aperiodically receiving the channel information 340 of the downlink component carrier from the user equipment 320 through one of the uplink component carriers in the channel information transmission mode of the downlink component carrier designated by the carrier identification information, as shown in the last two examples.
  • the user equipment 320 may include the control information receiver 322 receiving the control information 330 including the channel information request and the carrier identification information designating the channel information transmission mode of the downlink component carrier from the base station through one of the downlink component carriers, and the channel information transmitter 324 aperiodically transmitting the channel information 340 of the downlink component carrier to the base station 310 through one of the uplink component carriers in channel information transmission mode of the downlink component carrier designated by the carrier identification information.
  • control information related to the channel information may be transmitted to the user equipment from the base station even though additional resources of the control signal are not allocated.

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